(gdb) bt full #0 0x00000000004d673b in ast_channel_internal_bridge (chan=0x0) at channel_internal_api.c:1314 No locals. #1 0x00000000004d1383 in ast_channel_get_bridge (chan=0x0) at channel.c:10135 bridge = 0xc200000000 #2 0x00000000004763c4 in acquire_bridge (chan=0x0) at bridge.c:4057 bridge = 0x7fff00000002 __PRETTY_FUNCTION__ = "acquire_bridge" #3 0x0000000000476535 in ast_bridge_transfer_blind (is_external=1, transferer=0x0, exten=0x7ffff40d47d0 "511", context=0xffd4d0 "default", new_channel_cb=0x7fffa7ba07a0 , user_data=0x7ffff40d4760) at bridge.c:4097 bridge = 0x0 bridge_channel = 0x0 channels = 0x0 transferee = 0x0 do_bridge_transfer = 1 transfer_prohibited = -200456240 transfer_result = 32767 __PRETTY_FUNCTION__ = "ast_bridge_transfer_blind" #4 0x00007fffa7ba0361 in refer_incoming_blind_request (progress=, target=, rdata=, session=) at res_pjsip_refer.c:693 context = exten = "511\000\377\177", '\000' , "X\023\004\300\004\000\000\000\220\r\222\367\377\177\000\000\377\377\377\377\377\177\000\000\000\000\000\000\000\000\000" refer = {context = 0xffd4d0 "default", progress = 0x7fffc00350f8, rdata = 0x7fffd800b4b8, replaces = 0x0, refer_to = 0x7fffc00205c0} #5 refer_incoming_refer_request (session=0x7fffc00096d8, rdata=0x7fffd800b4b8) at res_pjsip_refer.c:880 refer_to = target = target_uri = 0x7fffc00205c0 progress = 0x7fffc00350f8 replaces = response = str_refer_to = {ptr = 0x7fffa7ba1a30 "Refer-To", slen = 8} str_to = {ptr = 0x7fffa7ba1a36 "To", slen = 2} str_replaces = {ptr = 0x7fffa7ba195a "Replaces", slen = 8} __PRETTY_FUNCTION__ = "refer_incoming_refer_request" #6 0x00007fffa7ba166b in refer_incoming_request (session=0x7fffc00096d8, rdata=0x7fffd800b4b8) at res_pjsip_refer.c:918 No locals. #7 0x00007fffb75b947f in handle_incoming_request (session=0x7fffc00096d8, rdata=0x7fffd800b4b8) at res_pjsip_session.c:1762 supplement = 0x7fffc000ee20 req = {method = {id = PJSIP_OTHER_METHOD, name = {ptr = 0x7fffd800c820 "REFER\177", slen = 5}}, uri = 0x7fffd800c828} __PRETTY_FUNCTION__ = "handle_incoming_request" #8 0x00007fffb75bba3a in session_inv_on_tsx_state_changed (inv=0x7fffc0008968, tsx=0x7fffc0041328, e=0x7ffff40d49e0) at res_pjsip_session.c:1975 cb = session = 0x7fffc00096d8 __PRETTY_FUNCTION__ = "session_inv_on_tsx_state_changed" #9 0x00007fffb73a1abb in mod_inv_on_tsx_state () from /usr/lib/libpjsip-ua.so.2 No symbol table info available. #10 0x00007fffb7183014 in pjsip_dlg_on_tsx_state () from /usr/lib/libpjsip.so.2 ---Type to continue, or q to quit--- No symbol table info available. #11 0x00007fffb717ca0b in tsx_set_state () from /usr/lib/libpjsip.so.2 No symbol table info available. #12 0x00007fffb717d3a8 in tsx_on_state_null () from /usr/lib/libpjsip.so.2 No symbol table info available. #13 0x00007fffb71801ca in pjsip_tsx_recv_msg () from /usr/lib/libpjsip.so.2 No symbol table info available. #14 0x00007fffb7182d6f in pjsip_dlg_on_rx_request () from /usr/lib/libpjsip.so.2 No symbol table info available. #15 0x00007fffb71844af in mod_ua_on_rx_request () from /usr/lib/libpjsip.so.2 No symbol table info available. #16 0x00007fffb7169db3 in pjsip_endpt_process_rx_data () from /usr/lib/libpjsip.so.2 No symbol table info available. #17 0x00007fffb56087be in distribute (data=0x7fffd800b4b8) at res_pjsip/pjsip_distributor.c:340 param = {start_prio = 0, start_mod = 0x7fffb5818c80, idx_after_start = 1, silent = 0} handled = rdata = 0x7fffd800b4b8 is_ack = 0 endpoint = #18 0x00000000005f7d20 in ast_taskprocessor_execute (tps=0x7fffc000e6e8) at taskprocessor.c:766 local = {local_data = 0x6774f4, data = 0xf7f8c8} t = 0x7fffd8004960 size = 0 __PRETTY_FUNCTION__ = "ast_taskprocessor_execute" #19 0x00000000005ff6a8 in execute_tasks (data=0x7fffc000e6e8) at threadpool.c:1152 tps = 0x7fffc000e6e8 #20 0x00000000005f7d20 in ast_taskprocessor_execute (tps=0xf7f8c8) at taskprocessor.c:766 local = {local_data = 0x7ffff40d4da0, data = 0x5ff478} t = 0x7fffd8004990 size = 32767 __PRETTY_FUNCTION__ = "ast_taskprocessor_execute" #21 0x00000000005fded8 in threadpool_execute (pool=0xf81188) at threadpool.c:351 __PRETTY_FUNCTION__ = "threadpool_execute" #22 0x00000000005ff38e in worker_active (worker=0x7fffc4000ff8) at threadpool.c:1072 alive = 0 #23 0x00000000005ff14a in worker_start (arg=0x7fffc4000ff8) at threadpool.c:992 worker = 0x7fffc4000ff8 __PRETTY_FUNCTION__ = "worker_start" #24 0x000000000060a872 in dummy_start (data=0x7fffc4001110) at utils.c:1170 __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {0, -4263255298213314074, 140737288407936, 140737287903680, 0, 3, -4263255298171371034, 4263280741354013158}, __mask_was_saved = 0}}, __pad = { 0x7ffff40d4f40, 0x0, 0x0, 0x0}} __cancel_routine = 0x450052 __cancel_arg = 0x7ffff40d5700 __not_first_call = 0 ret = 0x0 a = {start_routine = 0x5ff0c3 , data = 0x7fffc4000ff8, name = 0x7fffc4001130 "worker_start started at [ 1046] threadpool.c worker_thread_start()"} #25 0x00007ffff5f41e9a in start_thread (arg=0x7ffff40d5700) at pthread_create.c:308 __res = pd = 0x7ffff40d5700 now = unwind_buf = {cancel_jmp_buf = {{jmp_buf = {1, 4263281562502660582, 140737288407936, 140737287903680, 0, 3, ---Type to continue, or q to quit--- -4263255298215411226, -4263259483130461722}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} not_first_call = 0 pagesize_m1 = sp = freesize = __PRETTY_FUNCTION__ = "start_thread" #26 0x00007ffff790bccd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112 No locals. #27 0x0000000000000000 in ?? () No symbol table info available.